Why in this expression
In[1]:= a = 1;
b = 2;
f[x_] := Which[x < a, 10, a <= x < b, 20, True, 30]
f[x]
Out[4]= Which[x < 1, 10, a <= x < b, 20, True, 30]
the values of a and b are substituted only in the first parameter to Which and not in the third?
I am using Mathematica 8 on OSX.
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